I just got off the phone with Nokia support and was told that flashing your device will void the one year warranty. You can install updates and things of that nature but no flashing the device. To do a 'clean' install you must send it in to a Nokia repair center, which are their retail centers. I just called to confirm and the one in Chicago said they are not doing hard resets for the phone. So you have to void the warranty, as confirmed by phone support and the salesman over the phone, to do a hard reset for the phone. Flashing will void the warranty, totally being redundant so you guys understand, and it is the only way to make it 'clean.'